you can use your trans and driverside mount you will need a teg rear mount. if you get the harness with the motor it will plug right into your civic at the shock tower, then all you have to to do is add wires for knock and IAB from the ecu to the shock tower. you can use the civic harness but then you will need to re route some of the wires on the civc harness ie mainlly O2, you can do this without splicing, you just have to seperate the O2 wires from the main harness and reoute them to the back of the engine, also if you use the civic harness you need to add IAB and knock to the engine harness as well as from the ecu to the shock tower
GL